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Why the canonical tag matters for WordPress
The canonical tag (rel=canonical) tells search engines which URL is the authoritative version of a page when multiple URLs can serve the same or similar content. Correct canonicalization prevents duplicate-content issues, consolidates link equity, and helps search engines index the right URL.
WordPress outputs a canonical link by default in many cases, but the default behaviour is not always ideal for every site (paginated content, attachment pages, query parameters, HTTPS/WWW preferences, custom post types, and complex URL structures). This tutorial shows a reliable, extensible PHP implementation you can add to your themes functions.php or as part of a small plugin to output correct canonical tags for common WordPress conditions.
Goals of the implementation
- Replace or override WPs default canonical output with a robust, self-contained function.
- Handle singular posts/pages (and paginated posts using
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